Example of using getopt(1) utility in bash

gistfile1.bash

#!/bin/bash

#   Example of using getopt(1) utility to parse script arguments
#   Copyright (C) 2011  Radek Pazdera

#   This program is free software: you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation, either version 3 of the License, or
#   (at your option) any later version.

#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.

#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.

ARGS=`getopt -o "123:" -l "one,two,three:" -n "getopt.sh" -- "$@"`

#Bad arguments
if [ $? -ne 0 ];
then
  exit 1
fi

eval set -- "$ARGS"

while true;
do
  case "$1" in
    -1|--one) 
      echo "Uno"
      shift;;

    -2|--two)
      echo "Dos"
      shift;;

    -3|--three)
      echo "Tres"
      
      # We need to take the argument
      if [ -n "$2" ];
      then
        echo "Argument: $2"
      fi
      shift 2;;

    --)
      shift
      break;;
  esac
done

Seems missing shift after esac on line 53.